You will appear nowhere. Somewhere between future and past because if you got your pen in the past, in the future, you will have that pen, and because of having the pen, you don't need to go to the past, because you already got the pen, and since you didn't travel to past, you won't have your pen, and that will loop forever AUTOMATICALLY, and you'll be in a place between Time and space and be trapped forever, unless in the fourt dimension happens something the humans we don't understand, that would let us time travel without any problem of screwing the entire time, with that pen.